Electric heating element



May 28, 1929.

H. w. HEAD 1,715,287

ELECTRIC HEATING ELEMENT Filed July 14, 1925 Patented May 218, 1929.

UNITED STATES PATENT OFFICE.

HAROLD W. HEAD, 0F ROYAL OAK, MICHIGAN.

ELECTRIC HEATING ELEMENT.

Application filed July 14,

An object of my invention is to provide an electrical heating element inwhich the resistance coil will not sag or in event ot' breakage will notcause a short circuit.

Another object of the invention is to suitably arrange a column ofprocelain insulators to permit flexibility and at the same time securelyhouse the lheating element.

Another object seeks to provide a flexible heating'unit which may beeasily Withdrawn -urthermore my construction permits easy assembling anddisassenibling and ready replacement of broken or Worn parts.

A still further object is to provide means for holding the resistanceelement so that it is at no time enclosed thereby preventing a loss ofheat and, at the same time, prolong the eventual burning out of theelement.

lVith the preceding and other objects and advantages in'mind theinvention consists in the novel combination of elements, constructionsand arrangement of parts to be hereinafter enlarged upon, claimed andillustrated in the accompanying drawing, wherein:

Figure 1 is a longitudinal sectional viewpartly in section-of theheating unit.

Figure 2 is a horizontal sectional view on line\\2-2 of Fig. 1.

Fig. 3 is a similar horizontal sectional view online 3-3 of Fig. 1.

Fig. 4. is a perspective view of one of the insulating disks, and

Fig. 5 is a longitudinal sectional view of a standard Water heatershowing a heating ele-` ment installed therein.

Similar parts are referred to by the same reference charactersthroughout the several views.

A cylindrical tube 6, preferably of copper,

A has a closed end 7 and an open end provided with a iange 8 adapted torest on a shoulder 9 of an internally threaded socket 10 in a casting11.

The ange 8 is held in Water-tight engagement with a shoulder 9 by meansof a screw threaded ring 12 inserted in socket 10.

An extension 13 is provided on casting 11 by means of which it may beattached to any standard radiator or Water heater. The heating elementdesignated in its entirety as 14 is inserted into the copper tube 6. Theelement comprises a number of porcelain disks 15 formed into a columnand a resistance coil 16 inserted on the disks 15.

Terminals 17 of the coil 16 are connected to binding posts 18 attachedto and insulated the resistance coil 16.

One of the insulating disks, preferably made of porcelain or otherceramic material, is shown in detail in Fig. #1. Around the Wall,periphery or circumference of each disk 15 are a number of equidistantrecesses or cut away portions 21 opening at 22. The insulating ivalls 23between adjacent recesses has a flat face or Wall 24: and a curved-inconvex Wall 25.

In assembling the disks to form a column adjoining or adjacent disks arereversed as shown in Fig. 3. This novel method of staggering therecesses in the disks permits however a continuous aperture or slotthrough which the resistance coiled Wire is passed.

This construction prevents the coil 16 from being entirely enclosed aswill be seen in Fig. 1.and permits the heat to more quickly dissipate.

At the top and bottom of the column of disks 15 is a porcelain disk 26having a plurality of apertures 27 Which correspond in position with theslots 21. These apertures are connected on the face of the disk by anannular ring 28 as shown in Fig. 2.

Each disk 15 has Qn its top and base a lug 29 and recess 30 to lock inposition and prevent rotation as is clearly shown.

Fig. 5 shows a common Water tank heating boiler or tank 31 provided witha cold-water inlet pipe 32 and a hot-Water outlet pipe 33 and theheating element which is surrounded by copper tube 6.

The reversing of the insulating disks 15 prevents the Wire from saggingwhereby the Wire might touch Ythe copper tube 6. Should the Wire breakit cannot touch the copper tube preventing a charged radiator whichmight cause a fire. In eect my construction makes a foolproof and safetydevice. f

Various types of end disks could be used. It should be clearly seen thatno portion of the resistance coiled Wire is covered. On the contrary theWire is quite exposed. On this feature l Wish to lay special stress.

Should the tank 31 shown in Fig. 5 be located in anl inaccessible placethe object of making my column flexible Will be seen. The entire heatingelement is removed from the top of the tank and can be bent While beingremoved.

It must be understood that only a preferred embodiment of my inventionis herein shown and described and that any departure from it, such as inshape, size or arrangement of parts, may be resorted to Withoutdeparting from the spirit or the scope of the subjoined claims.

Having thus described my invention, what I claim is:

1. An electrical heating element comprising an insulating body formed ofa plurality of separable sections, means on each section to engage anadjacent section and prevent relative rotation of said sections and aplurality of resistance coils Within said body forming the soleconnection between said sections to yieldingly connect said sections.

'2. An` electrical heating element'comprising an insulating body formedof a plurality of separate sections, means on each section to engage anadjacent section and prevent relative rotation of said sections, andlaterally and longitudinally yieldable electrical resistance nieanspassing longitudinally through said sections for holding said sectionsassembled.

3. An electrical heating element comprising an insulating body formed ofa plurality of disks having a. plurality of peripheral longitudinalgrooves, the grooves in one disk -body parallel with the axis of thebody and forming the sole means for holding said disks assembled.

4. An electrical heating element compris ing an insulating body formedof a plurality of separate disks provided with a plurality of groovesextending inwardly from the peripheral surface ofthe disks, at an angleto planes radial of said disks, a series of resistance coilsextendinglongitudinally of said body parallel with the axis thereof insaid grooves and yieldingly connecting said disks and holding the samein longitudinal alignment.

5. An electrical heating element comprising an insulating body formed ofa plurality ot' disks formed with peripheral longitudinal grooves andend disks formed with holes to align with the ends ot said grooves, anda series of resistance coils in said grooves and united at their endsthrough said holes in the end disks. said coils being under tension toyieldingly hold the several disks in assembled relation and inalignment, and means on said disks to prevent relative rotation thereof.

HAROLD lV. HEAD.

